gist14116.rb

require 'active_record'
require 'minitest/autorun'

ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.establish_connection(adapter: 'mysql2', database: 'test', username:'root')

class Home < ActiveRecord::Base
  connection.create_table table_name, force: true do |t|
    t.string :name
  end
  has_many :home_users, dependent: :destroy
  has_many :users, through: :home_users
end

class User < ActiveRecord::Base
  connection.create_table table_name, force: true do |t|
  end
  has_many :home_users
  has_many :homes, through: :home_users
end

class HomeUser < ActiveRecord::Base
  connection.create_table table_name, force: true do |t|
    t.integer :home_id
    t.integer :user_id
  end
  belongs_to :home
  belongs_to :user
end

class BugTest < MiniTest::Unit::TestCase
  def test_home
    home = Home.create!
    user = User.create!(home_ids: [home.id])
    assert_equal 1, home.id
    assert user.homes.exists?(id: home.id)
    assert user.reload.homes.exists?(id: home.id)
  end
end